[totem] screensaver: Pause playback when screensaver comes on

[Bastien Nocera <hadess src gnome org>]

commit 336154c47dc415299e54b260c5438def6afd6f8b
Author: Bastien Nocera <hadess hadess net>
Date:   Thu Feb 6 15:48:49 2014 +0100

    screensaver: Pause playback when screensaver comes on
    
    If the screensaver comes on, that means that the user locked the
    screen on purpose, so stop playback, they can't see anything anymore.

 src/plugins/screensaver/totem-screensaver.c |   61 +++++++++++++++++++++++++++
 1 files changed, 61 insertions(+), 0 deletions(-)
---
diff --git a/src/plugins/screensaver/totem-screensaver.c b/src/plugins/screensaver/totem-screensaver.c
index 36d7929..4d137ae 100644
--- a/src/plugins/screensaver/totem-screensaver.c
+++ b/src/plugins/screensaver/totem-screensaver.c
@@ -50,6 +50,9 @@ typedef struct {
        TotemObject *totem;
        BaconVideoWidget *bvw;
 
+       GDBusProxy    *screensaver;
+       GCancellable  *cancellable;
+
        gboolean       inhibit_available;
        guint          handler_id_playing;
        guint          inhibit_cookie;
@@ -113,6 +116,47 @@ property_notify_cb (TotemObject *totem,
 }
 
 static void
+screensaver_signal_cb (GDBusProxy  *proxy,
+                      const gchar *sender_name,
+                      const gchar *signal_name,
+                      GVariant    *parameters,
+                      gpointer     user_data)
+{
+       TotemScreensaverPlugin *pi = user_data;
+
+       if (g_strcmp0 (signal_name, "ActiveChanged") == 0) {
+               gboolean active;
+
+               g_variant_get (parameters, "(b)", &active);
+               if (active)
+                       totem_object_pause (pi->priv->totem);
+       }
+}
+
+static void
+screensaver_proxy_ready_cb (GObject      *source_object,
+                           GAsyncResult *res,
+                           gpointer      user_data)
+{
+       TotemScreensaverPlugin *pi;
+       GDBusProxy *proxy;
+       GError *error = NULL;
+
+       proxy = g_dbus_proxy_new_for_bus_finish (res, &error);
+       if (!proxy) {
+               if (!g_error_matches (error, G_IO_ERROR, G_IO_ERROR_CANCELLED))
+                       g_warning ("Failed to acquire screensaver proxy: %s", error->message);
+               g_error_free (error);
+               return;
+       }
+
+       pi = TOTEM_SCREENSAVER_PLUGIN (user_data);
+       pi->priv->screensaver = proxy;
+       g_signal_connect (G_OBJECT (proxy), "g-signal",
+                         G_CALLBACK (screensaver_signal_cb), pi);
+}
+
+static void
 impl_activate (PeasActivatable *plugin)
 {
        TotemScreensaverPlugin *pi = TOTEM_SCREENSAVER_PLUGIN (plugin);
@@ -130,6 +174,17 @@ impl_activate (PeasActivatable *plugin)
 
        pi->priv->totem = g_object_ref (totem);
 
+       pi->priv->cancellable = g_cancellable_new ();
+       g_dbus_proxy_new_for_bus (G_BUS_TYPE_SESSION,
+                                 G_DBUS_PROXY_FLAGS_DO_NOT_LOAD_PROPERTIES,
+                                 NULL,
+                                 "org.gnome.ScreenSaver",
+                                 "/org/gnome/ScreenSaver",
+                                 "org.gnome.ScreenSaver",
+                                 pi->priv->cancellable,
+                                 screensaver_proxy_ready_cb,
+                                 pi);
+
        /* Force setting the current status */
        totem_screensaver_update_from_state (totem, pi);
 }
@@ -139,6 +194,12 @@ impl_deactivate    (PeasActivatable *plugin)
 {
        TotemScreensaverPlugin *pi = TOTEM_SCREENSAVER_PLUGIN (plugin);
 
+       if (pi->priv->cancellable) {
+               g_cancellable_cancel (pi->priv->cancellable);
+               g_clear_object (&pi->priv->cancellable);
+       }
+       g_clear_object (&pi->priv->screensaver);
+
        if (pi->priv->handler_id_playing != 0) {
                TotemObject *totem;
                totem = g_object_get_data (G_OBJECT (plugin), "object");